body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 20px;
    background-color: #f4f4f4;
    color: #333;
}

h1 {
    color: #2c3e50;
    border-bottom: 3px solid #e74c3c;
    padding-bottom: 10px;
}


h2 {
    color: #34495e;
    margin-top: 30px;
}

h3 {
    color: #7f8c8d;
}

.intro {
    font-size: 1.1em;
    background-color: #ecf0f1;
    padding: 15px;
    border-left: 4px solid #3498db;
    margin: 20px 0;
}

.highlight {
    background-color: #f39c12;
    color: white;
    padding: 2px 6px;
    border-radius: 3px;
    font-weight: bold;
}

.caption {
    font-style: italic;
    color: #7f8c8d;
    font-size: 0.9em;
}

#diagram-section {
    background-color: white;
    padding: 20px;
    margin: 30px 0;
    border-radius: 8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}


ul, ol {
    background-color: white;
    padding: 20px 40px;
    border-radius: 5px;
}


li {
    margin: 10px 0;
}


a {
    color: #3498db;
    text-decoration: none;
    font-weight: bold;
}

a:hover {
    text-decoration: underline;
    color: #2980b9;
}

footer {
    margin-top: 50px;
    padding-top: 20px;
    border-top: 2px solid #bdc3c7;
    text-align: center;
    color: #7f8c8d;
}


img {
    display: block;
    margin: 20px auto;
    border: 2px solid #bdc3c7;
    border-radius: 5px;
}